[ticket/16893] Remove mentions template files and CSS from ACP

PHPBB3-16893

phpBB/adm/style/admin.css

@@ -1670,103 +1670,6 @@ fieldset.submit-buttons legend {
 	}
 }
 
-/* Mentions and mention dropdown
----------------------------------------- */
-.mention {
-	font-weight: bold;
-}
-
-.mention-container {
-	text-align: left;
-	background-color: #ffffff;
-	border-radius: 2px;
-	box-shadow:
-		0 3px 1px -2px rgba(0, 0, 0, 0.2),
-		0 2px 2px 0 rgba(0, 0, 0, 0.14),
-		0 1px 5px 0 rgba(0, 0, 0, 0.12);
-	position: absolute;
-	z-index: 999;
-	overflow: auto; /* placed here for list to scroll with arrow key press */
-	max-height: 200px;
-	transition: all 0.2s ease;
-}
-
-.rtl .mention-container {
-	text-align: right;
-}
-
-.mention-list {
-	margin: 0;
-	padding: 0;
-	list-style-type: none;
-}
-
-.mention-media {
-	color: #757575;
-	display: inline-flex;
-	flex-shrink: 0;
-	justify-content: center;
-	align-items: center;
-	margin-right: 8px;
-	margin-left: 0;
-}
-
-.rtl .mention-media {
-	margin-right: 0;
-	margin-left: 16px;
-}
-
-.mention-media-avatar {
-	width: 40px;
-	height: 40px;
-}
-
-.mention-item {
-	font-size: 16px;
-	font-weight: 400;
-	line-height: 1.5;
-	letter-spacing: 0.04em;
-	border-bottom: 1px solid #dddddd;
-	color: #212121;
-	position: relative;
-	display: flex;
-	overflow: hidden;
-	justify-content: flex-start;
-	align-items: center;
-	padding: 8px;
-	cursor: pointer;
-}
-
-.mention-item:hover,
-.mention-item.is-active {
-	text-decoration: none;
-	background-color: #eeeeee;
-	color: #2d80d2;
-}
-
-.mention-item:hover .mention-media-avatar,
-.mention-item.is-active .mention-media-avatar {
-	color: #2d80d2;
-}
-
-.mention-name,
-.mention-rank {
-	display: block;
-}
-
-.mention-name {
-	line-height: 1.25;
-	margin-right: 20px; /* needed to account for scrollbar bug on Firefox for Windows */
-}
-
-.mention-rank {
-	font-size: 14px;
-	font-weight: 400;
-	line-height: 1.2871;
-	letter-spacing: 0.04em;
-	color: #757575;
-}
-
 /* Input field styles
 ---------------------------------------- */
 input.radio,